Tube DIY Asylum

Yes, I used to do the same. But no more todate. (long)

69.156.196.162

In Reply to: RE: Grounding Scheme posted by throbbinnut on July 01, 2008 at 10:40:04

Hi.

Yes, this is the old school type of reference ground bus wirng since day one. Many still use it.

But to handle digital age today's RFI polluted ground buses, such common sharing ground connections is not good enough.

IMO, the properly way to handle nowadays RFI polluted ground buses - each stage should get its own LOCAL one-point signal reference ground bus connection, then linked together these one-point grounding bus connections to the powerstage signal reference ground point, which then becomes the whole amp's ONLY consorted one-point grounding point. Then wire it to the ground bolt located closest to the I/P signal jacks.

The idea is to make sure the heaviest current flow zone, (i.e. the powerstages), hence 'dirtiest', should go STRAIGHT to the chassis grounding bolt WITHOUT routing thru the ground buses of the frontal high gain stages, save RFI contaminating the front stages via the shared ground bus wire.

Also, if it is a stereo amp, make sure each channel should get its own siganl reference ground, no sharing at all.

If it is an IEC 3-wire powering, the green ground wire from the power cord also be connected direct to the chassis ground bolt, NOwhere else.

I am going it even with my phonostages, SS & tubes.

c-J

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